Improvement in paper-making machinery



'NITl-IIDl STATES PATENT @FICE EDWARD B. BINGHAM, OF NEWARK, NEW JERSEY.

IMPROVEMEN'I` IN PAPER-MAKING MACHINERY.

Specification forming part of Letters Patent No. 58,051, dated September 18, 1866.

To all whom it may concern:

Be it known that I, EDWARD B. BINGHAM, of Newark, in the county of Essex and State of New Jersey, have invented a new and useful Improvement in Paper-Making' Machinery; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanyingdrawing, forming part of this specification.

The objects of my invention are to prevent the breakage to which the web of pulp, more especially when made of straw and certain other kinds of stock. is liable in its passage between the presslrolls, and to deliver the webs from the second press-rolls to the drying-cylinders in a drier state. j

lt consists in a novel arrangement of two felts and four press-rolls, with doctors inside of the felt-s, whereby the web is subject, while being carried between the two felts, to three pressing operations, which are successively heavier, and the water is removed from the pressing-rolls and prevented from running back onto the felts and soiling them.

The improvement is applicable both to the cylinder and Fourdrinier machines. rIhe drawing represents it applied to a cylinder machine, and an explanation of this application of it will suggest to persons skilled 1n the art such modifications as may be necessary toadapt it to the Fourdrinier machine.

A is the cylinder, and B the vat in which it works. C is the coucher. D D' are the first press-rolls, and E E' the second press-rolls, the journal-boxes of which are-all arranged in suitable housings, and loaded in the usual luann er to produce the requisite pressure.

The two pairs of press-rolls are arranged with their axes all in the same vertical plane, and so that the lower one, D, of the first pair bears upon the upper one, E', of the second pair, so that the web is pressed three times in passing between the four rolls.

The lirst felt, Gr, which may be considered the same as the single one commonly employed, passes around the concher, around the lower iirst press-roll, D, back between that one and the upper second press-roll, E', around the latter, and forward again between the rolls E' E, thence around guide-rolls H I J K to the coucher. 4

The additional felt N passes around the back of the upper iirst press-roll, D', forward over and along with the belt G between the rolls D' and D, back under and along with the felt G between D and E, forward again over and along with the felt G, between E' and E, thence around guide-rolls L M, back to the upper iirst press-roll, D'.

The web of pulp is taken from the cylinder by the coucher and first felt, G, and carried along by the said felt to the rolls D D', when it meets the second felt, N, between which and the felt- G it passes forward between the rolls. It then returns between the two felts as the latter pass between the rolls D and E', and afterward passes forward again between the two felts as the latter pass between the rolls E E', and is thereby subject to three distinct pressing operations-viz., first between D D', next between D E', and iinally between E E', and thence to the driers.

It will be understood that in the rst pressure, when the web is wet and very tender, it is only subject to the weight of the roll D', but iu the second it is subject to the weight of the two rolls D' and D, and in the third to the weight of D', D, and E', the pressures being thus increased as the web becomes drier and stronger and better able to bear an increased pressure.

Doctors P Q are applied to the press-rolls D and E' within the felts at such points as are necessary to remove the water from the surfaces of the said rolls and prevent it from running back onto the felts and soiling them.

I have used the term "felts in this speciication ou account of its being commonly employed in the trade to designate the endless aprons used in paper-making machines to carry the web to and between the pressrolls5 but I do not limit myself to the use of any particular fabric for such felts-or aprons.

I have also described the invention as applied to paper-making; but it is also applicable to the manufacture of boards.

That I claim as my invention, and desire to secure by Letters Patent, is-

The arrangement of the two felts and four pressure-rolls as herein described, whereby the web is pressed three times between the two felts, in combination with the arrangement of the doctors l? Q within the felts to re move the water from the rolls D E', as herein Set forth.

EDI/VARD B. BINGHAM.

Witnesses:

A. LECLERC, HENRY T. Bnown. 

